Superfine cobalt alloy powder and preparation method thereof

Abstract

The invention provides a superfine cobalt alloy powder and a preparation method thereof. The preparation method comprises the following steps: (1) stirring and ball milling: mixing raw materials including cobalt carbonate or cobalt oxalate, nickel carbonate or nickel oxalate, ferrous carbonate or ferrous oxalate and Al2O3, adding an oleic acid dispersant, feeding into a stirring ball mill, stirring and ball milling for a certain time period and obtaining mixed powder, wherein the raw materials contain 20 weight percent of Ni, 20 weight percent of Fe, 1 weight percent of Al2O3 and the balance of Co and other elements; and (2) powder reduction: reducing the mixed powder obtained by the step (1) in a hydrogen reduction furnace and obtaining superfine cobalt alloy powder. In the superfine cobalt powder of the invention, the use of nickel in place of part of cobalt saves cobalt resources considerably, a solid solution strengthening phase and a dispersion strengthening phase change the tendency that the conventional cobalt-containing powder material is susceptible to generating cobalt pool and alloy crystal aggregation and growth after being sintered, and the wear resistance, hardness, strength and fracture toughness are high.

Description

technical field [0001] The invention relates to the field of metal alloys, in particular to an ultrafine cobalt alloy powder and a preparation method thereof. Background technique [0002] Metal cobalt and its alloy powder are one of the main raw materials for the preparation of magnetic materials, ceramic materials, hard alloys, diamond tools and other materials. In my country, the commonly used cobalt powder is mainly conventional cobalt powder prepared by carbonyl method, electrolysis method, reduction method or atomization method. The Fischer particle size fluctuates from 1 to 10 μm. About 30μm. This type of conventional cobalt powder is often not suitable for the preparation of high-energy batteries, high-strength hard alloys and other high-quality, refined and sharp products due to its large particle size. [0003] The Chinese patent application document with the publication number CN101100001A discloses a superfine cobalt powder and its manufacturing process. The sup...

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Problems solved by technology

However, the simple cobalt-nickel mixed powder has disadvantages such as coarse particle size, no disperse strengthening phase, and poor solid solution strengthening effect, which leads to problems such as material performance degradation, which greatly limits its application field.